CN101126788A - Inserting bolt type test lead checking circuit and its method - Google Patents
Inserting bolt type test lead checking circuit and its method Download PDFInfo
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- CN101126788A CN101126788A CNA2006101159148A CN200610115914A CN101126788A CN 101126788 A CN101126788 A CN 101126788A CN A2006101159148 A CNA2006101159148 A CN A2006101159148A CN 200610115914 A CN200610115914 A CN 200610115914A CN 101126788 A CN101126788 A CN 101126788A
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- test lead
- inserting bolt
- unit
- bolt type
- recognition unit
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Abstract
The utility model discloses a low error rate and latch test lead detection circuit and the method. During the lead detection operation of a test mode or a fuse failure mode, the detection circuit is inserted into the test-pins to stop automatic oscillation. During the period of the lead detection of the test mode, if the test-pins lead is inserted into a jack provided with a separate contact sheet metal, an oscillating unit is automatically stopped oscillation, and the output of a quiescent state is maintained. Conversely, if the test-pins lead is not inserted into the jack provided with the separate contact sheet metal, an expected frequency waveform is generated by the oscillating unit based on an oscillation circuit. During the period of the fuse failure mode, the test lead is inserted into the input jack. During the period of a current measurement mode, when a test-pins lead is inserted into the jack provided with the separate contact sheet metal, a protection unit and a shunt form a serial of parallel circuit. Compared with the impedance of the protection unit, the impedance of the shunt can be neglected, and the voltage drop bridging the both ends of the shunt is proportionate to an injection current.
Description
Technical field
The invention relates to a kind of electronic measuring instrument, particularly about test lead (test lead) testing circuit.
Background technology
In the various electronic measuring instruments, all need to utilize test lead (test lead) and electronic measuring instrument coupling, measure so as to being connected on the determinand.The general test lead-in wire connects and comprises two ends, one end is connected to determinand, the other end so that the various physical quantitys on the determinand (for example voltage, electric current and power etc.) are transferred to electronic measuring instrument by test lead, is measured its required parameter value in order in the socket that inserts electronic measuring instrument.Usually electronic measuring instrument mostly has a plurality of sockets, is used to measure different physical quantitys; During measuring voltage, with this socket; When measuring electric current, use another socket.When measuring electric current, because it is very low to be connected to the metering circuit resistance of current measurement socket,, may cause a high current value to flow through current measurement circuit so the voltage of a high-voltage value is put on the current measurement socket, cause electronic measuring instrument to damage.
Summary of the invention
The present invention discloses a kind of inserting bolt type test lead checking circuit, is used for detecting the socket situation whether a test lead (testlead) is present in the separate type contact metal film of electronic measuring instrument, and this inserting bolt type test lead checking circuit comprises:
One shunt (shunt) is coupled in an end of ground wire and this separate type contact metal film socket; One oscillating unit is coupled to this separate type contact metal film other end by a protective unit, is used to produce pulse or static output; One recognition unit is coupled to this oscillating unit, is received from the output signal that this oscillating unit transmits, and is used to judge the state of the inserting bolt type test lead checking circuit that utilizes this oscillatory circuit.
The present invention discloses a kind of inserting bolt type test lead detection method of utilizing oscillatory circuit again, comprises: the operator scheme of being set this inserting bolt type test lead checking circuit by this recognition unit; Test lead has or not the socket that inserts this separate type contact metal film, and this oscillating unit all can send a signal to this recognition unit; After recognition unit is received from the signal of oscillating unit, judge the state of this inserting bolt type test lead checking circuit; Recognition unit is according to its judged result, and transmission information is notified the user.
Description of drawings
Fig. 1 is a system diagram, according to embodiments of the invention, in order to narrate low its framework of error inserting bolt type test lead checking circuit of the present invention.
Fig. 2 is a circuit diagram, according to embodiments of the invention, in order to the circuit diagram of narration Fig. 1 framework.
Fig. 3 is a process flow diagram, according to embodiments of the invention, in order to inserting bolt type test lead detection method of the present invention to be described.
Fig. 4 is one according to embodiments of the invention, utilizes application example of the present invention in order to narration.
Fig. 5 is the expected frequency waveform figure that Fig. 4 oscillatory circuit produces.
Fig. 6 is the quiescent voltage figure that Fig. 4 oscillatory circuit produces.
Symbol description:
100 inserting bolt type test lead checking circuits
102 shunts
104 fuses
106 separate type contact metal film sockets
108 protective units
110 oscillating units
112 recognition units
114 sheet metals
116 sheet metals
118 CPU (central processing unit)
120 I/O ports
122 random access memory
124 counter timers
400 application circuits
402 oscillatory circuits
404 recognition units
406 CPU (central processing unit)
408 I/O ports
410 counters
412 counter timers
Step S100, S120, S140, S160.
Embodiment
The present invention will cooperate its preferred embodiment and the diagram of enclosing to be specified in down, should the person of understanding only be the usefulness of illustration for all preferred embodiments among the present invention, and therefore the preferred embodiment in literary composition, the present invention also can be widely used among other embodiment.And the present invention is not limited to any embodiment, should be with the claim of enclosing and equivalent fields thereof and decide.
Run through in the patent specification, " preferred embodiment " means a specific characteristic, structure or the characteristic of description about preferred embodiment, and in the present invention, its preferred embodiment number is at least one.Therefore, occur in this instructions " in the preferred embodiment ", needn't be fully with reference to same embodiment.Moreover its specific characteristic, structure or characteristic can use any proper method to be mixed in the preferred embodiment.
With reference to Fig. 1, according to preferred embodiment of the present invention, a system block diagrams is described, in order to an inserting bolt type test lead checking circuit 100 to be described.Inserting bolt type test lead checking circuit 100 comprises a shunt (shunt) 102, is connected to ground wire, in order to shunting and the current value of measuring object under test; One oscillating unit 110 is used to produce pulse or static output; One recognition unit 112 is coupled to oscillating unit 110, is received from the output signal that oscillating unit 110 is transmitted, and is used to judge the state of inserting bolt type test lead checking circuit 100; One fuse (fuse) 104 is connected serially to shunt 102, is used to prevent overcurrent to flow to shunt 102 by fuse; One protective unit 108 is coupled to oscillating unit 110, and its protective unit 108 has high impedance value, prevents error current self-oscillation unit 110 shunt 102 of flowing through; One separate type contact metal film socket (jack) 106 has two contact metal films 114 and 116, and sheet metal 114 be coupled to ground wire, and sheet metal 116 is coupled to protective unit 108 by the tandem paths of fuse 104 with shunt 102.
Refer again to Fig. 1, according to preferred embodiment of the present invention, if test-pins lead is inserted joint or is had in the socket 106 of separate type contact metal film, then its test lead bridge joint plays 114 of sheet metal 116 and sheet metals, create a circuit paths, make protective unit 108, fuse 104 and shunt 102 connect into the path of connecting, be coupled to ground wire.Then its oscillating unit 110 is the automatic failure of oscillations, and keeps static state (quiescent state) output, is sent to recognition unit 112.Otherwise if its test-pins lead is not inserted joint or had the socket of separate type contact metal film, then sheet metal 114 and 116 is open circuit (open), and then oscillating unit 110 will produce the pulse of an expected frequence, be sent to recognition unit 112.Then recognition unit 112 is received from the signal (oscillator signal or static output) that oscillating unit 110 is transmitted, and discerns the state of its oscillating unit 110.
With reference to Fig. 2, according to preferred embodiment of the present invention, the circuit diagram of the thin narration Fig. 1 of portion framework.Fig. 2 describes shunt 102, protective unit 108, oscillating unit 110 and recognition unit 112 in detail.
The shunt 102 that is illustrated in Fig. 2 comprises a resistance, has atomic little resistance value, compares as if the resistance value with protective unit 108, and its shunt resistance value can be similar to be ignored; Protective unit 108 comprises the resistance R 3 of a high resistance, puts on separate type contact metal film socket 106 in order to prevent the high voltage that does not have expection; Oscillating unit 110 comprises the oscillatory circuit of an operational amplifier (OPA), resistance R 1, R2, R5, R6 and a capacitor C, produces charge and discharge phenomena by resistance R 6 and capacitor C, so as to constantly changing output state, to reach the function of outputting oscillation signal; Recognition unit 112 contains a CPU (central processing unit) 118, be used for judging its inserting bolt type test lead checking circuit 100 states of identification, one I/O port (I/Oport) 120, externally link up bridge as CPU (central processing unit) 118, one random-access memory (ram) (this paper also can claim counter (counter)) 122, the signal period of counting self-oscillation unit 110 outputs, and store the output state of its oscillating unit 110, transmit count information to CPU (central processing unit) 118 by input/output end port 120 subsequently, one counter timer (timer) 124, set in advance a setting-up time (set time), when arriving its setting-up time, its counter timer 124 stops counting, and by input/output end port 120, transmission information notice CPU (central processing unit) 118.
With reference to Fig. 2, at first, when test lead does not insert separate type contact metal film socket 106, sheet metal 114 does not contact with sheet metal 116, meaning is that sheet metal 114 is by the tandem paths of fuse 104 with shunt 102, and resistance R 3 paths that sheet metal 116 is coupled to protective unit are open-circuit condition, and the electric current that does not therefore have a self-oscillation unit (also can claim oscillatory circuit in this paper) 110 is flowed through the tandem paths of resistance R 3, separate type contact metal film socket 106, fuse 104 and shunt 102 to ground wire.
With reference to Fig. 2, operational amplifier the 4th end points of oscillatory circuit 110 has voltage V
-, the 8th end points has voltage V
+, the output terminal of its operational amplifier is the 1st end, its output voltage V
oLook its operational amplifier the 2nd end voltage over the ground and (mean capacitor C voltage V over the ground
c) and reference voltage V
Ref(its reference voltage is an output voltage V
oThe tandem paths that puts on by resistance R 2, R1 is coupled to ground connection, and its resistance R 1 is coupled to ground connection, the output voltage that it is assigned with respect to resistance R 1 resistance in series R2:
), its comparative result and deciding.When test lead does not insert separate type contact metal film socket 106, if capacitor C voltage V
c=0, this moment output voltage V
oEqual the voltage V of the 8th end
+, then capacitor C by be connected to resistance R 6 from output terminal, capacitor C is coupled to the grounding path store charge, up to capacitor C voltage V
cGreater than reference voltage V
Ref, then be input into operational amplifier the 2nd terminal voltage greater than the 3rd end, then the output voltage V of operational amplifier
oTransition becomes voltage V
-, then capacitor C discharge and according to the reverse charging of same paths is up to as capacitor C voltage V
cLess than V
Ref, be input into operational amplifier the 3rd terminal voltage greater than the 2nd end, then output voltage V this moment
oEqual voltage V
+, then capacitor C is again by this path charging.Then circulate repeatedly, then output voltage V by above-mentioned situation
oConstantly in voltage V
+With voltage V
-Between conversion vibration.
If test lead inserts separate type contact metal film socket 106, then its test lead bridge joint plays 114 of sheet metal 116 and sheet metals, create a circuit paths, make protective unit 108 resistance R 3, fuse 104 and shunt 102 connect into the path of connecting, be coupled to ground wire.Then by output terminal by the flow through electric current of capacitor of resistance R 6, to flow to resistance R 3, fuse 104 and shunt 102 and connect into a connect path and be coupled to ground wire, then capacitor C stops repeated charge, keep a current potential identical with node A, then oscillatory circuit 110 failures of oscillations, and export a quiescent voltage value to recognition unit 112.
With reference to Fig. 2 and Fig. 3, according to embodiments of the invention, in order to inserting bolt type test lead detection method of the present invention to be described.At first, the user sets the operator scheme (step S100) of inserting bolt type test lead checking circuit 100 via recognition unit 112.Inserting bolt type test lead checking circuit 100 comprises three operator schemes, is respectively test lead detecting pattern, fuse open circuit detecting pattern and current measurement pattern, and the user can choose an operator scheme according to demand wantonly.
After the user sets the operator scheme of inserting bolt type test lead checking circuit 100 via recognition unit 112, which kind of no matter be under the operator scheme, test lead has or not the socket 106 that inserts the separate type contact metal film, and oscillating unit all can send a signal to recognition unit 112 (step S120).The user inserts the socket 106 of separate type contact metal film with test lead, and then oscillatory circuit 110 is the failure of oscillations, and exports a quiescent voltage value to recognition unit 112.Otherwise if its test-pins lead is not inserted joint or had the socket of separate type contact metal film, then sheet metal 114 and 116 is open circuit (open), and then oscillating unit 110 will produce the pulse of an expected frequence, be sent to recognition unit 112.
Or for example inserting bolt type test lead checking circuit 100 is the current measurement pattern, if test lead does not insert the socket 106 of separate type contact metal film, oscillating unit 110 will transmit oscillator signal to recognition unit 112, the oscillator signal that recognition unit 112 is received from oscillating unit 110 is judged as the socket 106 that fuse failure or user do not insert test lead the separate type contact metal film, and recognition unit 112 will send the information reminding user and insert test lead or check fuse 104 (blown) (the step S160) that whether fuse.Or for example inserting bolt type test lead checking circuit 100 is the fuse open circuit mode, when test lead inserts the socket 106 of separate type contact metal film, if fuse 104 does not exist, oscillating unit 110 will transmit oscillator signal to recognition unit 112, it is open circuit or fusing that the oscillator signal that recognition unit 112 is received from oscillating unit 110 is judged as fuse 104, and recognition unit 112 will send the information reminding user and change fuse.(step S160)
With reference to Fig. 4, according to embodiments of the invention, for utilizing application example of the present invention.In the application circuit 400 of Fig. 4, comprise a resistance R 4, be connected to ground wire, have atomic little resistance value, compare as if resistance value (2.5M Ω) with R3, its R4 resistance value can be similar to be ignored; One fuse F (max-flow is 15A through the magnitude of current) is connected serially to R4, is used to prevent overcurrent to flow to R4 by fuse F; One separate type contact metal film socket A-INPUT has upper and lower two contact metal films, and following sheet metal is coupled to ground wire by the tandem paths of fuse F and R4, is coupled to R3 and go up sheet metal; R3 is the resistance of a high resistance, puts on separate type contact metal film socket A-INPUT in order to prevent the high voltage that does not have expection; One oscillatory circuit 402 and R3 coupling, for comprising the circuit of an operational amplifier (model is TL062), resistance R 1, R2, R5, R6 and a capacitor C, produce charge and discharge phenomena by resistance R 6 and capacitor C, so as to constantly changing output state, to reach the function of outputting oscillation signal; One recognition unit 404, be coupled to oscillatory circuit 402 output terminals (the 1st end of operational amplifier), contain a CPU (central processing unit) 406, be used for judging its inserting bolt type test lead checking circuit 400 states of identification, one I/O port 408, externally link up bridge as CPU (central processing unit) 406, one counter 410, the signal period of counting self-oscillating circuit 402 outputs, and store the output state of its oscillatory circuit 402, transmit count information to CPU (central processing unit) 406 by input/output end port 408 subsequently, one counter timer 412, set in advance a setting-up time, when arriving its setting-up time, its counter timer 412 stops counting, and by input/output end port 408, transmission information notice CPU (central processing unit) 406.
Table one is the parameters of Fig. 4 oscillatory circuit 402:
| Standard | C+10％ R6+5％ R1+1％ R2-1％ | C-10％ R6-5％ R1-1％ R2+1％ | ||||
| Representative value | Minimum value | Maximal value | ||||
| C | 1.00E-09 | F | 1.10E-09 | F | 9.00E-10 | F |
| R6 | 3.60E+06 | Ω | 3.96E+06 | Ω | 3.24E+06 | Ω |
| R1 | 1.00E+04 | Ω | 1.10E+04 | Ω | 9.00E+03 | Ω |
| R2 | 4.99E+03 | Ω | 4.94E+03 | Ω | 5.04E+03 | Ω |
| Oscillation frequency | 86.21071054 | Hz | 67.670177 | Hz | 112.8195 | Hz |
| The oscillation frequency minimum value | 67.670177 | Hz | ||||
| The oscillation frequency maximal value | 112.81952 | Hz |
Table one oscillation frequency wherein, available oscillation frequency formula is calculated its oscillation frequency.
With reference to Fig. 4, at first, when test lead does not insert separate type contact metal film socket A-INPUT, upper and lower sheet metal does not contact, meaning is promptly descended the tandem paths of sheet metal by fuse F and resistance R 4, and go up sheet metal and be coupled to resistance R 3 paths and be open-circuit condition, the electric current that does not therefore have a self-oscillating circuit 402 is flowed through the tandem paths of resistance R 3, separate type contact metal film socket A-INPUT, fuse F and resistance R 4 to ground wire.Then oscillatory circuit 402 will produce the recognition unit 404 of an expected frequency waveform, as the waveform of Fig. 5.
If when test lead inserted separate type contact metal film socket A-INPUT, then its test lead bridge joint rose between upper and lower sheet metal, creates a circuit paths, make resistance R 3, fuse and resistance R 4 connect into the path of connecting, be coupled to ground wire.Then by operational amplifier output terminal (the 1st end) by the flow through electric current of capacitor C of resistance R 6, to flow to resistance R 3, fuse F and resistance R 4 and connect into a connect path and be coupled to ground wire, then capacitor C stops repeated charge, keep a current potential identical with node A, then oscillatory circuit 402 failures of oscillations, and export a quiescent voltage value to recognition unit 404, the quiescent voltage of its output can be " high levle " or " low level ", as the waveform of Fig. 6.
Below be the illustration that CPU (central processing unit) 406 is judged the determining step of oscillator signal:
1. set per 6.6 milliseconds, detect the signal of self-oscillating circuit 402 outputs.
2. the setting-up time of setting counter timer 412 is 264 milliseconds.
3. the count initialized timer 412, and set counter 410 to zero, store oscillatory circuit 402 output states to counter 410.
4. per 6.6 milliseconds of signals that detect self-oscillating circuit 402 outputs, counter 410 will increase once instantaneous output, and store output state.
5. counter timer 412 reaches setting-up time, judges counter 410 states.
A. counter number of times＞1 is to represent test lead not insert separate type contact metal film socket A-INPUT.
B. counter number of times≤1 is to represent test lead to insert separate type contact metal film socket A-INPUT.
6. repeating step 3 to 5, its signal of cycle detection.
The present invention illustrates as above that with preferred embodiment so it is not in order to limit the patent right scope that the present invention advocated.Its scope of patent protection when on claim and etc. same domain decide.All skill persons who is familiar with this field, in not breaking away from this patent spirit or scope, change of being done or retouching all belong to the equivalence of being finished under the disclosed spirit and change or design, and should be included in the claim.
Claims (10)
1. an inserting bolt type test lead checking circuit is used for detecting the socket situation that comprises two separate type contact metal films at least whether a test lead is present in electronic measuring instrument, and this inserting bolt type test lead checking circuit comprises:
One shunt is coupled in an end of ground wire and this separate type contact metal film socket;
One oscillating unit is coupled to this separate type contact metal film other end by a protective unit, is used to produce pulse or static output; And
One recognition unit is coupled to this oscillating unit, is received from the output signal that this oscillating unit transmits, and is used to judge the state of the inserting bolt type test lead checking circuit that utilizes this oscillating unit.
2. inserting bolt type test lead checking circuit as claimed in claim 1, wherein this shunt comprises a resistance.
3. inserting bolt type test lead checking circuit as claimed in claim 1, wherein this protective unit is coupled to oscillating unit, has high impedance value, prevent error current self-oscillation unit stream through shunt, and this protective unit resistance value comparison shunt resistance value, its shunt resistance value can be ignored.
4. inserting bolt type test lead checking circuit as claimed in claim 1 wherein also comprises a fuse.
5. inserting bolt type test lead detection method comprises:
Set the operator scheme of inserting bolt type test lead checking circuit by recognition unit;
Test lead has or not the socket that inserts this separate type contact metal film, and oscillating unit sends a signal to this recognition unit;
After recognition unit is received from the signal of oscillating unit, judge the state of this inserting bolt type test lead checking circuit; And
Recognition unit is according to its judged result, and transmission information is notified the user.
6. inserting bolt type test lead detection method as claimed in claim 5, the operator scheme of wherein said inserting bolt type test lead checking circuit comprises test lead detecting pattern, fuse open circuit detecting pattern and current measurement pattern.
7. inserting bolt type test lead detection method as claimed in claim 5, wherein said test lead inserts the socket of separate type contact metal film, and then this oscillating unit is the failure of oscillations, and exports a quiescent voltage value to recognition unit; Test lead does not insert the socket of separate type contact metal film, and then this oscillating unit will produce the pulse of an expected frequence, is sent to this recognition unit.
8. inserting bolt type test lead detection method as claimed in claim 5, the operator scheme of wherein said inserting bolt type test lead checking circuit is the test lead detecting pattern, if test lead inserts the socket of separate type contact metal film, then this oscillating unit will transmit quiescent voltage to this recognition unit, and this recognition unit sends the socket that the information notification user please don't insert test lead the separate type contact metal film.
9. inserting bolt type test lead detection method as claimed in claim 5, the operator scheme of wherein said inserting bolt type test lead checking circuit is the current measurement pattern, if test lead does not insert the socket of this separate type contact metal film, this oscillating unit will transmit oscillator signal to this recognition unit, and this recognition unit will send the information reminding user and insert test lead or check whether fuse fuses.
10. inserting bolt type test lead detection method as claimed in claim 5, the operator scheme of wherein said inserting bolt type test lead checking circuit is the fuse open circuit mode, when test lead inserts the socket of this separate type contact metal film, if fuse does not exist, this oscillating unit will transmit oscillator signal to this recognition unit, the oscillator signal that this recognition unit is received from this oscillating unit is judged as fuse system open circuit or fusing, and this recognition unit will send the information reminding user and change fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101159148A CN101126788A (en) | 2006-08-18 | 2006-08-18 | Inserting bolt type test lead checking circuit and its method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101159148A CN101126788A (en) | 2006-08-18 | 2006-08-18 | Inserting bolt type test lead checking circuit and its method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101126788A true CN101126788A (en) | 2008-02-20 |
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ID=39094861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101159148A Pending CN101126788A (en) | 2006-08-18 | 2006-08-18 | Inserting bolt type test lead checking circuit and its method |
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| Country | Link |
|---|---|
| CN (1) | CN101126788A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103546114A (en) * | 2013-10-30 | 2014-01-29 | 华为技术有限公司 | Circuit and method for adjusting pull-up voltage of bus according to pull-up voltage of slave unit |
-
2006
- 2006-08-18 CN CNA2006101159148A patent/CN101126788A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103546114A (en) * | 2013-10-30 | 2014-01-29 | 华为技术有限公司 | Circuit and method for adjusting pull-up voltage of bus according to pull-up voltage of slave unit |
| WO2015062261A1 (en) * | 2013-10-30 | 2015-05-07 | 华为技术有限公司 | Circuit for adjusting pull-up voltage of bus according to pull-up voltage of slave device, and method therefor |
| CN103546114B (en) * | 2013-10-30 | 2016-08-24 | 华为技术有限公司 | Circuit according to pull-up voltage in the pull-up Voltage Cortrol bus of equipment and method thereof |
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Owner name: ANJELEN SCI. & TECH. INC. Free format text: FORMER OWNER: ESCORT INSTRUMENTS CORPORATION Effective date: 20080919 |
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Effective date of registration: 20080919 Address after: American California Applicant after: Anjelen Sci. & Tech. Inc. Address before: Taiwan County, Taipei, China Applicant before: Escort Instruments Corporation |
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